Lifting-jack.



B. LARSEN.

LIFTING JACK.

APPLICATION FILED 0CT.26, 1914.

Patented Apr. 13, 1915.

2 SHEETS-SHEET 1.

THE NORRIS PETERS 6a.. PHO'rc-LITHQ, WASHINGTON, D. c.

B. LARSEN.

LIFTING JACK.

APPLICATION FILED 0cT.26. 1914.

Patented Apr. 13, 1915.

2 SHEETSSHBET 2.

$51 fly m after/"ug l l l l l COMPANY, OF NILES, MICHIGAN.

LIFTING-J'AGK.

Patented Apr. is, rare.

Application filed October 26, 1914. Serial No. 868,624.

To all whom it may concern:

Be it known that I, BERTINIUS LARSEN, a citizen of the United States, residing at iles, Michigan, have invented certain new and useful Improvements in Lifting-Jacks, of which the following is a specification.

taken lookingin the direction of the little arrows at the ends of the section lines.

eferring to the drawing, the standard or frame 1 The standard is adapted to receive the lifting bar 3 which is provided with a rack 4 on This invention relates to improvements in one side. The lifting bar is provided with lifting jacks. a head 5, the head being provided with a The main objects of this invention are: step 6.

First, to provide an improved gear lifting jack which 1s powerful and at the same tune of compact structure and well The actuating shaft 7 is mounted in the frame transversely of the adapted for v small jacks such as automobile jacks. Secon the shaft 10 which 1s also disposed to provide in a lifting jack an untransversely of the lack and provided with proved reversing mechanism. a pinion ll meshing with the rack The Further ob ects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention y the devices and means described in the it being disposed between the ratchet wheel following specification. and the rame. The actuating pawl 16 is he invention is clearly defined and pointpivoted on the lever at 17 to coact with the ed out in the claims. ratchet, the pawl facin upwardly as shown A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which:

Figure I is a front perspective view of a structure embodying the features of my invention. Fig. II isa detail side view looking from the left of Fig. I with. the side plate 37 of the housing 34 versing member being locked in its inoperative position. Fig. III is a similar view with the reversing member and the reversing plate locking lever removed. Fig. IV is a detail side view of the opposite or right hand side of the jack with the side plate 13 of the housing 12 removed. Fig. V is a detail view partially in vertical section on a line corresponding to line 5-5 of Fig. VI. reversing member. he reversing member Fig. VI is a detail vertical section on a line is provided with a cam corresponding to line 6-6 of Fig. III. Fig. adapted to act on the detail side view looking from the pawl and with left of Fig. I with the side plate 37 readapted to act on the pin of the actuating moved, the reversing member being shown pawl. he reversing member has upwardly in its operative position, the lever and 00- projecting fingers 29 and 30 one at each end lding above the ratchet wheel, that 1s, it is arranged oppositely to the actuating pawl. The pawl 19 is mounted on a projecting stud 20 on the frame and is provided with a spring 21 carried by the stud 22 projecting from the frame above the stud 20. The pawls are provided with laterally projecting pins a3 adapted to versing plate or member 24. The reversing member 24 is pivoted on the shaft 7 on the outer side of the ratchet wheel. The reversing member is actuated by the U-shaped spring 25 one arm of which is mounted on the stud 26 projecting from the frame its other arm bearing on the rear edge of the pin of the holding a. cam 28 on its lower edge acting parts being shown by full lines in 0 its cam 27. The reversing member is the position occupied when the lever is in held in its inoperative position by the cam its lower position, and by dotted lines when lever 31 which is pivoted at 32 to project the lever isin its upper or raised position through a slot 33 in the housing 34. v The In the drawin 27 on its upper edge coact with the resition, as shown in} Fig; 11, it being carried to its inoperative position by the cam 36 on the lever. The finger 29 serves as a stop for 131 is. thrown into lifting the holding pawl from the rack. The

. upward or lowering stroke of the lever brings the pin of the actuatingpawlinto contact with the cam 28 rocking the reverswing member rearwardly until the holding f 'same forward and by, step l r itflis well adapted for use as an awl Jdr'opsinto engagement with the ratchet as shown by dotted lines in Fig. VII. -As soon as the load is released from the actuating pawl the tension of the spring 25acting on the reversing plate throws the the tension of the pawl spring. 18 disengages the actuating pawl and holds it from engagement with the-ratchetduring the return stroke of the lever. As the. lever reaches the end of its down stroke the reversing member permits the-reengageand as soon as ment, of the actuating pawl the holding paw, is relieved of its load the reversing plate disengages it and the action maybe repeated, the movement being a step movement. The housing 34 is provided'with aremovable face plate 37 which affords full access to the parts.

Myimproved lifting jack is very power- 7 ful and at the same time isfcompact so that automobile ja'ck. 'v The jack may beadaptedgfor raising orlowering as desired merely by the shifting of the lever 31.

' I have not attempted to illustrate or describe certain modifications which Iconf as template as I believe the disclosure made will enablethose skilled in the art to which my invention relates to embody or adapt the same as conditions may require. I desire as claimingmy improvementsspecifically in the form illustratedas well as broadly within the scope of the appended claims.

Having thus described invention, what Q I claim as new and desire tosecure by Let thereon, a shaft, driving connections for if meshing with said raclr,

ters Patent, 1s 1; In a l'ft'ng jack the combination with having a rack the frame, of alifting bar said shaft to; said rack including a pinion a ratchet wheel on .said shaft, anv actuating lever pivotally mounted on saidshaft on the inner side of frame disposed above and coacting with the the lifting bar the leverv said ratchet wheel, an actuating pawl on said lever coacting with the under side of said ratchet wheel, a holding pawl on sai upper side of said having outwardly springs for ratchet wheel, said pawls projecting pins thereon, said pawls, a reversing member pivotally mounted on said shaft on the outer side of said ratchet wheel and having a pair of spaced fingers on its upper edge with a cam between coacting with the pin on said holding pawl, and acam on its under edge coacting with said pin on said actuating pawl, a spring acting on said reversing member, and a cam lever for shifting said reversing member to and retaining it in its inoperative position, said lever having a notch therein adapted to receive one of the fingers of said reversing member when shifted to inoperative position by said cam lever.

2. In a lifting jack the combination with the frame, of a lifting bar having a rack thereon, a shaft, driving connections for said shaft to said rack including a pinion meshing with said rack, a ratchet wheel on said shaft, an actuating lever pivotally mounted on said shaft on the inner side of said ratchet wheel, an actuating pawl on said lever coacting with the under side. of said ratchet wheel, a holding pawl on said. frame disposed above and coacting with the upper side of said ratchet wheel, said pawls having outwardly projecting pins thereon, springs for said pawls, a. reversing member pivotally mounted onsaid shaft on the outer side of said ratchet wheel and having a cam on its'upperedge coacting with the pin on saidholding pawl, and a cam on its under edge coacting with said pin on said actuating pawl, a spring acting on said reversing member, and means for ing member in its inoperative position.

3. In a lifting jack the combination with the frame, of a lifting bar having a rack thereon, a shaft, driving connections for said shaft to said rack including a pinion meshing with said rack, a ratchet wheel on said shaft, an actuating lever pivotally mounted on said shaft on the inner side of said ratchet wheel, an actuating pawl'on said lever coacting with said ratchet wheel, a holding pawl disposed oppositely to said actuating pawl, springs for said pawls, a reversing member pivotally mounted on said shaft on the outer side of said ratchet' wheel to coact with both of said pawls whereby they are alternately engaged and disengaged, a spring action on said reversing member, and means for. retaining said reversing member in it inoperativeposition.

4:. In a lifting jack, the combination of an actuating shaft, a ratchet wheel on said shaft, an actuating lever pivotally mounted on said shaft, an actuating pawl on said lever coacting with the under side of said holding said. reverss ratchet wheel, a holding pawl disposed above and coacting with the upper side of said ratchet wheel, said pawls having outwardly projecting pins thereon, springs for said pa'wls, a reversing member pivotally mounted on said shaft and having a cam on its upper edge and stops at the end of said cam coacting with the pin on said holding pawl, and a cam on its under edge coacting with said pin on said actuating pawl, a spring acting on said reversing member, and means for shifting said reversing member to and retaining it in its inoperative position.

In a lifting jack, the combination of an actuating shaft, a ratchet wheel on said shaft, an actuating lever pivotally mounted on said shaft, an actuating pawl on said lever coacting with said ratchet wheel, a

holding pawl disposed oppositely to said actuating pawl, springs for said pawls, a spring actuated reversing member pivotally mounted on said shaft to coact with both of said pawls, and means for retaining said actuating member in its inoperative position.

6. In a lifting jack, the combination of an actuating shaft, a ratchet wheel on said shaft, an actuating lever pivotally mounted on said shaft, an actuating pawl on said lever coacting with said ratchet wheel, a holding pawl disposed oppositely to said actuating pawl, springs for said pawls, a spring actuated reversing member pivotally mounted on said shaft and disposed between said pawls to swing forward and disengage said holding pawl when said pawl is relieved of its load, said reversing plate being engaged by the actuating pawl-0n the lowering stroke of the lever and actuated against its spring to permit the engagement of said holding pawl, said actuating pawl being disengaged on being relieved of its load, by said reversing member, and being held therebv from engagement with said ratchet during the return stroke of the lever, and means for retaining said reversing member in its inoperative position.

7. In a lifting jack, the combination of an Copies of this patent may be obtained for five cents each, by addressing the actuating shaft, a ratchet wheel on said shaft, an actuating lever pivotally mounted on said shaft, an actuating pawl on said lever coacting with said ratchet wheel, a holding pawl, springs for said pawls, a spring actuated reversing member pivotally mounted on said shaft and arranged to swing forward and disengage said holding pawl when said pawl is relieved of its load, said reversing plate being engaged by the actuating pawl on the lowering stroke of the lever and actuated against its spring to permit the engagement of said holding pawl, said actuating pawl being disengaged on being relieved of its load, by said reversing member, and being held thereby from engagement with said ratchet during the return stroke of the lever, and means for retaining said reversing member in its inoperative position.

8. In a lifting jack, the combination of an actuating ratchet wheel, an actuating lever, an actuating pawl on said lever coacting with said ratchet wheel, a holding pawl disposed oppositely to said actuating pawl, springs for said pawls, a spring actuated pivotally mounted reversing member disposed between said pawls to swing forward and disengage said holding pawl when said pawl is relieved of its load, said reversing plate being engaged by the actuating pawl on the lowering stroke of the lever and actuated against its spring to permit the reengagement of said holding pawl, said actuating pawl being disengaged on being relieved of its load, by said reversing member, and being held thereby from reengagement with said ratchet during the return stroke of the lever, and means for retaining said reversing member in its inoperative position.

In witness whereof, I have hereunto set my hand and seal 1n the presence of two wituesses.

Witnesses:

ANNA MILLER, IN. T. PARK.

Commissioner of Patents,

Washington, D. G. 

